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Very Useful Add-on Rated 5 out of 5 stars
This is very useful add-on, especially for any email server supporting webmail only (No POP/IMAP access)
However when I set rediffmail and click icon webpage surely opened thunderbird but also opened in IE (or default browser), but incase built in web apps such action is not seen
also any web app configured in option menu and if some thing goes wrong then it is not possible to edit anything but to remove app and add correct app is the only option, so edit option is required